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Error while opening xls contents


I am getting below error when I try to open the attached contents using Aspose.Cells(V4.4.3.19). I need to convert these contents in to 2007 format.

Contents :
excel tab 1.xls
excel tab 2.xls
FSIDMT_SS_Hypo Table_Pro.xls

Error :
Could not open the input Excel file.
Object reference not set to an instance of an object.

what could be the reason for this error?



Please try the attached version/latest fix, I have tested opening/saving your files with it, all the files work fine with the attached version.

Thank you.